<http://schema.org/description>
"You can create an extra credit column in the Grade Center and assign points as needed."^^<http://www.w3.org/2001/XMLSchema#string>
<https://en-us.help.blackboard.com/Learn/9.1_Older_Versions/9.1_2014_and_2015/Instructor/120_Grade_Center/010_Customize_Grade_Center/010_Grade_Center_Columns/060_Extra_Credit_Columns>